Solid-state track recorder neutron dosimetry in the Three-Mile Island Unit-2 reactor cavity

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Solid-state track recorder (SSTR) neutron dosimetry has been conducted in the Three-Mile Island Unit (TMI-2) reactor cavity (i.e., the annular gap between the pressure vessel and the biological shield) for nondestructive assessment of the fuel distribution. Two axial stringers were deployed in the annular gap with 17 SSTR dosimeters located on each stringer. SSTR experimental results reveal that neutron streaming, upward from the bottom of the reactor cavity region, dominates the observed neutron intensity. These absolute thermal neutron flux observations are consistent with the presence of a significant amount of fuel debris lying at the bottom of the reactor vessel. ... continued below

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Gold, R.; Roberts, J.H.; Ruddy, F.H.; Preston, C.C. & McElroy, W.N. April 1, 1985.

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Description

Solid-state track recorder (SSTR) neutron dosimetry has been conducted in the Three-Mile Island Unit (TMI-2) reactor cavity (i.e., the annular gap between the pressure vessel and the biological shield) for nondestructive assessment of the fuel distribution. Two axial stringers were deployed in the annular gap with 17 SSTR dosimeters located on each stringer. SSTR experimental results reveal that neutron streaming, upward from the bottom of the reactor cavity region, dominates the observed neutron intensity. These absolute thermal neutron flux observations are consistent with the presence of a significant amount of fuel debris lying at the bottom of the reactor vessel. A conservative lower bound estimated from these SSTR data implies that there are at least 2 tonnes of fuel, which is roughly 4 fuel assemblies, at the bottom of the vessel. The existence of significant neutron streaming also explains the high count rate observed with the source range monitors (SRMs) that are located in the TMI-2 reactor cavity.

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  • Other: DE85011360
  • Report No.: HEDL-7484
  • Grant Number: AC06-76FF02170
  • DOI: 10.2172/5732080 | External Link
  • Office of Scientific & Technical Information Report Number: 5732080
  • Archival Resource Key: ark:/67531/metadc1093056

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Office of Scientific & Technical Information Technical Reports

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Creation Date

  • April 1, 1985

Added to The UNT Digital Library

  • Feb. 10, 2018, 10:06 p.m.

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  • June 8, 2018, 7:16 p.m.

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Gold, R.; Roberts, J.H.; Ruddy, F.H.; Preston, C.C. & McElroy, W.N. Solid-state track recorder neutron dosimetry in the Three-Mile Island Unit-2 reactor cavity, report, April 1, 1985; Richland, Washington. (digital.library.unt.edu/ark:/67531/metadc1093056/: accessed October 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.